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Old 01-20-12, 09:43 PM   #1
rcnute
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Brompton: singlespeed to multi?

Hi, folks: Suppose I was (were?) to buy a singlespeed Brompton. Any reason why I couldn't convert it to a gearie down the road with the appropriate hub/shifters? If I'm overlooking something I'd rather know now. Thanks!
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Old 01-21-12, 12:35 AM   #2
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I have converted a Dahon single speed to a 3 speed internal hub. It can be done with relative ease if your bike is a steel frame bike. Aluminum frames are iffy at best.
Much more information here: http://sheldonbrown.com/frame-spacing.html. I used this article myself when I was in the process of converting my own folding bike.
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Old 01-21-12, 12:48 AM   #3
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There are many options for a geared Brommie. You could do 3-, 5-, or 8- speed.
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Old 01-21-12, 04:00 AM   #4
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newer ones have the mount for the speed shifter for 2 or 6 speed .

Outside of theirs, A sachs/sram 3by2, & 2 Sturmey Archer offerings,
other IGH can be fitted,
but you need to have your mechanic's chops up to the task.

Last edited by fietsbob; 01-22-12 at 02:31 PM.
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Old 01-22-12, 04:37 AM   #5
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Every factory Brompton uses the same frame with different components, forks and/or swingarms.
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Old 01-22-12, 07:47 AM   #6
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http://www.tillercycles.co.uk/page5.html
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Old 01-24-12, 07:53 AM   #7
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The single speed Brompton wheel has the same hub that is used for the 2-speed. So you could change to a 2-speed by purchasing two cogs, the dearilleur, 2-speed chain tensioner, shifter and cable kit. You'll probably also need a longer chain.

Going to a 3 or 6-speed will also require a new wheel and the appropriate tensioner/shifter/cables, etc.

Brompton offers some of these parts together as upgrade kits.

One of the great things about Brompton is that they make so many parts available to do things like gearing changes/upgrades. However, it can be expensive and mechanically non-intuitive (if not difficult) if you're not used to working on Bromptons. Be sure to check with a dealer before you get started with a gearing change, unless you're confident you know everything such a project would entail.

Best of luck.
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Old 01-24-12, 11:11 AM   #8
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You can find here all the brompton parts you may need (use check boxes on the left for more parts). They ship internationally.

http://www.sjscycles.co.uk/brompton-...ey=cat&cat=758

There are also third party gearing kits like this http://www.kinetics-online.co.uk/html/8-speed.shtml
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Old 02-19-12, 02:49 PM   #9
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Quote:
Originally Posted by rcnute View Post
Hi, folks: Suppose I was (were?) to buy a singlespeed Brompton. Any reason why I couldn't convert it to a gearie down the road with the appropriate hub/shifters? If I'm overlooking something I'd rather know now. Thanks!
Might be stating the obvious to the OP but.....

Bromptom has a non standard rear axle width
Frame needs a 112mm approx hub compared to standard 135mm.
Upgrades thefore need to use a narrow compactable hub, there are a few internal geared hubs in this size.

Just checking
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Old 02-19-12, 04:19 PM   #10
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There are retrofits of the SA 8 speed , requires pulling a bunch of spacers
off the axle , left side I suppose.
I think Kinetics, a shop in Scotland offers a kit made up of TW made SA parts,
hub and a small chainring crankset.
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